HD 143183
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HD 143183 is a red supergiant variable star of spectral type M3Ia in constellation Norma. It is a member of the Norma OB1 association, at a distance of about 2 kiloparsecs. It is one of the most luminous red supergiants with a luminosity over 250,000 times greater than the Sun (Template:Solar luminosity), and is as well one of the largest stars with a radius more than a thousand times that of the Sun (Template:Solar radius).[2] Older studies frequently calculated higher luminosities and radii.[3][4] It has an estimated mass loss rate of Template:Val per year[3] and has been once described as a cool hypergiant.[5] It is surrounded by a dozen early-type stars and a circumstellar nebula which extends Template:Convert.
HD 143183 is catalogued with the variable star designation V558 Normae as its brightness varies irregularly between apparent magnitudes 7.3 and 8.6.[6]
It is possible that HD 143183 is a spectroscopic binary with an OB+ companion but this is considered doubtful.[3] HD 143183 lies approximately 1' from the 10th-magnitude O-class bright giant CD-53 6363, the second-brightest star in the cluster.
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